linux-kernel - Arrays of variable length

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Message-ID: <CA+i0qc5_NFqb=_6P46yrebrQYzSuCCKgq_xyeui_x6nTRGx62A@mail.gmail.com>
Date:   Sun, 5 Mar 2017 11:44:33 +0200
From:   Tomas Winkler <tomasw@...il.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        sparse@...r.kernel.org
Subject: Arrays of variable length

Sparse complains for arrays declared with variable length

'warning: Variable length array is used'

Prior to c99 this was not allowed but lgcc (c99) doesn't have problem
with that  https://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html.
And also Linux kernel compilation with W=1 doesn't complain.

Since sparse is used extensively would like to ask what is the correct
usage of arrays of variable length
within Linux Kernel.

Thanks
Tomas